JP7073230B2 - Display device - Google Patents

Description

The present invention relates to a display device.

In recent years, a touch detection device capable of detecting an external proximity object, which is a so-called touch panel, has attracted attention. The touch panel is mounted or integrated on a display device such as a liquid crystal display device, and is used as a display device with a touch detection device. Capacitance method and electromagnetic induction method are known as a method for detecting such an external proximity object. In the electromagnetic induction method, the display device is provided with a coil that generates a magnetic field and a coil that detects the magnetic field. The pen, which is an external object, is provided with a coil and a capacitive element that form a resonance circuit. The display device detects the pen by electromagnetic induction between each coil of the display device and the coil in the pen. The following Patent Document 1 describes an electromagnetic induction type coordinate input device.

Japanese Unexamined Patent Publication No. 10-49301

The configuration of the detection target and the detection electrode differs greatly between the capacitance method and the electromagnetic induction method. Therefore, if the electrodes and various wirings provided in the display device and their drive configurations are adopted as they are in the electromagnetic induction method, it may be difficult to perform good touch detection in the electromagnetic induction method.

An object of the present invention is to provide a display device capable of satisfactorily performing touch detection of the electromagnetic induction method while sharing various wirings provided in the display device as electrodes of the electromagnetic induction method.

The display device according to one aspect of the present invention includes a substrate, a plurality of pixel electrodes, a plurality of detection electrodes arranged in a matrix in the display region of the substrate, and a plurality of detection electrodes connected to each of the plurality of detection electrodes. Switching connected to each of a plurality of first electrodes provided in the same layer as the detection electrode wiring and either the detection electrode or the detection electrode wiring and extending in the first direction, and the plurality of pixel electrodes. An element, a plurality of signal lines connected to the switching element and extending in a second direction intersecting the first direction, and ends of the plurality of first electrodes provided in a peripheral region outside the display region. It has a connecting member for connecting the portions, and a drive circuit for outputting a first drive signal during the first sensor period by the electromagnetic induction method.

The display device according to one aspect of the present invention includes a substrate, a plurality of pixel electrodes, a plurality of detection electrodes arranged in a matrix in the display region of the substrate, and a plurality of detection electrodes connected to each of the plurality of detection electrodes. A detection electrode wiring, a switching element connected to each of the plurality of pixel electrodes, and a direction perpendicular to the substrate are provided between the semiconductor of the switching element and the substrate and extend in the first direction. A plurality of first electrodes provided in the same layer as either the detection electrode or the detection electrode wiring and extending in the second direction intersecting the first direction, and the outside of the display area. It has a connecting member provided in the peripheral region of the above and connecting the ends of the plurality of first electrodes, and a drive circuit that outputs a first drive signal during the first sensor period by the electromagnetic induction method.

The display device according to one aspect of the present invention includes a substrate, a plurality of pixel electrodes, a plurality of detection electrodes arranged in a matrix in the display region of the substrate, and a plurality of detection electrodes connected to each of the plurality of detection electrodes. The detection electrode wiring, the switching element connected to each of the plurality of pixel electrodes, the signal line connected to the switching element, and the shield electrode provided on the upper side of the detection electrode in the direction perpendicular to the substrate. And a first drive circuit that outputs a first drive signal to either the signal line or the shield electrode during the first sensor period by the electromagnetic induction method, and the shield electrode is the signal line. It has a plurality of wiring portions extending in a first direction that intersect with each other, and a connection portion provided in a peripheral region outside the display area and connecting the ends of the plurality of wiring portions.

FIG. 1 is a block diagram showing a configuration of a display device according to the first embodiment. FIG. 2 is an explanatory diagram for explaining touch detection of the electromagnetic induction method. FIG. 3 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the first embodiment. FIG. 4 is a plan view schematically showing the display device according to the first embodiment. FIG. 5 is a circuit diagram showing a pixel arrangement of the display device according to the first embodiment. FIG. 6 is a circuit diagram showing a connection configuration of the first electrode. FIG. 7 is a block diagram showing a drive circuit that supplies various signals. FIG. 8 is a plan view showing the detection electrode and the first electrode according to the first embodiment. FIG. 9 is a cross-sectional view taken along the line IX-IX'in FIG. FIG. 10 is a circuit diagram showing a connection configuration of signal lines according to the first embodiment. FIG. 11 is a plan view showing a detection electrode and a first electrode according to a modified example of the first embodiment. FIG. 12 is a circuit diagram showing a connection configuration of the first electrode according to the second embodiment. FIG. 13 is a circuit diagram showing a connection configuration of signal lines according to the second embodiment. FIG. 14 is a circuit diagram showing a connection configuration of the first electrode according to the third embodiment. FIG. 15 is a plan view showing the first electrode, the detection electrode, and the detection electrode wiring according to the third embodiment. FIG. 16 is a cross-sectional view taken along the line XVI-XVI'of FIG. FIG. 17 is a plan view showing the first electrode, the detection electrode, and the detection electrode wiring according to the modified example of the third embodiment. FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII'of FIG. FIG. 19 is a circuit diagram showing a connection configuration of the first electrode according to the fourth embodiment. FIG. 20 is a plan view showing the wiring of the first electrode and the detection electrode according to the fourth embodiment. FIG. 21 is a circuit diagram showing a connection configuration of the first electrode and the second electrode according to the fifth embodiment. FIG. 22 is an enlarged plan view showing the second electrode according to the fifth embodiment. FIG. 23 is an enlarged plan view showing a connection portion between the second electrode and the detection signal output line according to the fifth embodiment. FIG. 24 is a cross-sectional view taken along the line XXIV-XXIV'of FIG. 23. FIG. 25 is a plan view showing the wiring of the first electrode and the detection electrode according to the fifth embodiment. FIG. 26 is a timing waveform diagram showing an operation example of the display device according to the fifth embodiment. FIG. 27 is a circuit diagram showing a connection configuration of the first electrode and the second electrode according to the modified example of the fifth embodiment. FIG. 28 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the sixth embodiment. FIG. 29 is a plan view showing the detection electrode and the detection electrode wiring according to the sixth embodiment. FIG. 30 is a cross-sectional view taken along the line XXX-XXX' in FIG. 29. FIG. 31 is a plan view showing the guard electrode according to the sixth embodiment. FIG. 32 is a plan view showing a guard electrode according to a modified example of the third embodiment.

An embodiment (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the components described below can be combined as appropriate. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention, which are naturally included in the scope of the present invention. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

(First Embodiment)
FIG. 1 is a block diagram showing a configuration of a display device according to the first embodiment. The display device 1 of the present embodiment has a built-in detection function for detecting contact or proximity of the detected object to the display surface. As shown in FIG. 1, the display device 1 includes a display panel 20, a first detection control circuit 10, a second detection control circuit 12, a display control circuit 14, a gate driver 15, and a first connection switching circuit 16. A second connection switching circuit 17, a drive circuit 18, and a controller 200.

The display panel 20 is, for example, a liquid crystal display device that uses a liquid crystal display as a display element. The display panel 20 is a device that displays according to the scanning signal Vscan supplied from the gate driver 15. More specifically, the display panel 20 is a device that sequentially scans and displays one horizontal line at a time according to the scanning signal Vscan.

The controller 200 is a circuit that controls the display and detection of the display panel 20 by supplying a control signal Vctrl to the first detection control circuit 10, the second detection control circuit 12, and the display control circuit 14. The first detection control circuit 10, the second detection control circuit 12, and the display control circuit 14 are provided on the display panel 20 as drive ICs (Integrated Circuits) 19. However, the drive IC 19 may be provided on the wiring board 71 connected to the display panel 20 or the control circuit board. Further, at least a part of the first detection control circuit 10, the second detection control circuit 12, the drive circuit 18, and the display control circuit 14 may be provided on the display panel 20 without being built in the drive IC 19. The wiring board 71 is, for example, a flexible printed circuit board.

The display control circuit 14 supplies control signals to the gate driver 15 and the first connection switching circuit 16, respectively, based on the video signal Vdisp supplied from the controller 200.

The gate driver 15 is a circuit that supplies a scanning signal Vscan to the display panel 20 based on a control signal supplied from the display control circuit 14. In other words, the gate driver 15 is a circuit that sequentially selects one horizontal line to be displayed and driven.

The first connection switching circuit 16 and the second connection switching circuit 17 are switch circuits that change the connection state of the signal line SGL based on the switching signal Vss from the first detection control circuit 10. The first connection switching circuit 16 supplies the pixel signal Vpix to each pixel Pix of the display panel 20 based on the control signal supplied from the display control circuit 14 during the display period. Further, the display control circuit 14 supplies the display drive signal Vcomdc to the detection electrode 22 via the drive circuit 18 during the display period.

The display panel 20 includes a function of detecting the position of a finger in contact with or close to the display surface of the display panel 20 by touch detection of the self-capacitance method. Further, the display panel 20 includes a function of detecting the touch pen 100 in contact with or in close proximity to the display surface by the touch detection of the electromagnetic induction method. The timing controller TC controls the electromagnetic induction type touch detection by the first detection control circuit 10, the self-capacitance type touch detection by the second detection control circuit 12, and the display timing by the display control circuit 14. The control signals TSVD and TSHD are supplied.

The first detection control circuit 10 is a circuit that controls the touch detection of the electromagnetic induction method based on the control signals TSVD and TSHD supplied from the timing controller TC included in the drive IC 19. The first detection control circuit 10 is connected to the transmission coil CTx formed by the electrodes or wiring of the display panel 20 via the drive circuit 18 during the detection period of the electromagnetic induction method (hereinafter referred to as the first sensor period). 1 Drive signal VTP is supplied. When the receiving coil CRx of the display panel 20 detects the contact or proximity of the touch pen 100 by the electromagnetic induction method, the receiving coil CRx outputs the first detection signal Vdet1 to the first detection control circuit 10. In the present embodiment, the transmission coil CTx is the first electrode 23, and the reception coil CRx is the signal line SGL.

The second detection control circuit 12 is a circuit that controls touch detection of the capacitance method based on the control signals supplied from the controller 200 and the timing controller TC. The second detection control circuit 12 supplies the second drive signal VSELF to the detection electrode 22 of the display panel 20 via the drive circuit 18 during the detection period of the capacitance method (hereinafter referred to as the second sensor period). .. When the display panel 20 detects the contact or proximity of a finger by the capacitance method, the display panel 20 outputs the second detection signal Vdet2 to the second detection control circuit 12. The first drive signal VTP and the second drive signal VSELF are, for example, AC rectangular waves having a predetermined frequency (for example, about several kHz to several hundred kHz). The AC waveform of the first drive signal VTP and the second drive signal VSELF may be a sine wave or a triangular wave.

The first detection control circuit 10 includes a first detection circuit 11 that receives the first detection signal Vdet1 from the reception coil CRx. The first detection circuit 11 transmits the received first detection signal Vdet1 as an output signal to the outside of the display panel 20 (for example, the controller 200). Further, the second detection control circuit 12 includes a second detection circuit 13 that receives the second detection signal Vdet2 from the detection electrode 22. The second detection circuit 13 transmits the received second detection signal Vdet2 as an output signal to the outside of the display panel 20 (for example, the controller 200). The first detection circuit 11 and the second detection circuit 13 are, for example, analog front end (hereinafter referred to as AFE (Analog Front End)) circuits. The first detection circuit 11 and the second detection circuit 13 are signal adjustments such as, for example, a filter circuit for suppressing noise of the first detection signal Vdet1 and the second detection signal Vdet2 supplied to each of them, an amplifier circuit for amplifying a signal component, and the like. It is provided with a signal processing circuit for performing the above. The first detection circuit 11 and the second detection circuit 13 do not have a signal processing circuit, and supply the first detection signal Vdet1 and the second detection signal Vdet2 as output signals to the controller 200 as they are, and supply the controller 200 with a filter circuit or a filter circuit. A signal processing circuit such as an amplifier circuit may be provided.

The first detection control circuit 10 and the second detection control circuit 12 include an A / D conversion circuit, a signal processing circuit, a coordinate extraction circuit, and the like that process signals of the first detection signal Vdet1 and the second detection signal Vdet2, respectively. You may. Alternatively, the controller 200 may include a signal processing circuit, a coordinate extraction circuit, and the like.

The A / D conversion circuit samples the analog signals output from the display panel 20 and converts them into digital signals at the timing synchronized with the first drive signal VTP or the second drive signal VSELF.

The signal processing circuit is a logic circuit that detects the presence or absence of touch on the display panel 20 based on the output signal of the A / D conversion circuit. The signal processing circuit performs processing for extracting a signal (absolute value | ΔV |) of the difference between the detection signals by the finger. The signal processing circuit compares the absolute value | ΔV | with a predetermined threshold voltage, and if the absolute value | ΔV | is less than the threshold voltage, it is determined that the detected object is in a non-existent state. On the other hand, if the absolute value | ΔV | is equal to or higher than the threshold voltage, the signal processing circuit determines that the object to be detected exists.

The coordinate extraction circuit is a logic circuit that obtains the coordinates of the detected object when the detected object is detected in the signal processing circuit. The coordinate extraction circuit outputs the coordinates of the object to be detected as an output signal. The coordinate extraction circuit outputs the output signal to the outside of the display panel 20 (for example, the controller 200).

Next, with reference to FIG. 2, touch detection by the electromagnetic induction method of the display panel 20 of the present embodiment will be described. FIG. 2 is an explanatory diagram for explaining touch detection of the electromagnetic induction method.

As shown in FIG. 2, in the electromagnetic induction method, the contact or proximity of the touch pen 100 is detected. A resonance circuit 101 is provided inside the touch pen 100. The resonance circuit 101 is configured by connecting the coil 102 and the capacitive element 103 in parallel.

In the electromagnetic induction method, the transmission coil CTx and the reception coil CRx are provided so as to overlap each other. The transmitting coil CTx has a length in the first direction Dx, and the receiving coil CRx has a length in the second direction Dy. The receiving coil CRx is provided so as to intersect the transmitting coil CTx in a plan view. The transmitting coil CTx is connected to the drive circuit 18, and the receiving coil CRx is connected to the first detection circuit 11 (see FIG. 1).

As shown in FIG. 2, during the magnetic field generation period, an AC square wave having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied to the transmission coil CTx via the drive circuit 18 by the first detection control circuit 10. .. As a result, a current flows through the transmission coil CTx, and the transmission coil CTx generates a magnetic field M1 corresponding to this change in current. When the touch pen 100 is in contact with or in close proximity, an electromotive force due to mutual induction between the transmission coil CTx and the coil 102 is generated in the coil 102. As a result, the capacitive element 103 is charged.

Next, during the magnetic field detection period, the coil 102 of the touch pen 100 generates a magnetic field M2 that changes according to the resonance frequency of the resonance circuit 101. When the magnetic field M2 passes through the receiving coil CRx, an electromotive force due to mutual induction between the receiving coil CRx and the coil 102 is generated in the receiving coil CRx. A current corresponding to the electromotive force of the receiving coil CRx flows through the first detection circuit 11. The touch pen 100 is detected by scanning the transmission coil CTx and the reception coil CRx.

FIG. 3 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the first embodiment. FIG. 4 is a plan view schematically showing the display device according to the first embodiment. As shown in FIG. 3, the display device 1 includes an array substrate 2, a facing substrate 3, a liquid crystal layer 6, a polarizing plate 25, and a polarizing plate 35. The facing substrate 3 is arranged so as to face the surface of the array substrate 2 in a direction perpendicular to the surface. The liquid crystal layer 6 is provided between the array substrate 2 and the facing substrate 3.

The array substrate 2 includes a first substrate 21, a detection electrode 22, a first electrode 23, and a pixel electrode 24. The array board 2 is a drive circuit board for driving each pixel Pix, and is also called a backplane. The first board 21 has circuits such as a gate scanner included in the gate driver 15, switching elements Tr such as TFTs (Thin Film Transistors), and various wirings such as gate line GCL and signal line SGL (see FIG. 5). It will be provided. The pixel electrodes 24 are arranged in a matrix on one surface of the first substrate 21.

The detection electrode 22 and the first electrode 23 are provided between the first substrate 21 and the pixel electrode 24. The pixel electrode 24, the detection electrode 22, and the first electrode 23 are insulated from each other via an insulating layer 27. Further, a polarizing plate 25 is provided on the other surface of the first substrate 21 via the adhesive layer 26. In this embodiment, an example in which the pixel electrode 24 is provided on the upper side of the detection electrode 22 and the first electrode 23 has been described, but at least one of the detection electrode 22 and the first electrode 23 is provided on the upper side of the pixel electrode 24. May be. In other words, the pixel electrode 24 may be arranged between the first substrate 21 and at least one of the detection electrode 22 and the first electrode 23.

Further, the drive IC 19 and the wiring board 71 are provided on the first board 21. The drive IC 19 includes all or a part of the functions of the first detection control circuit 10, the second detection control circuit 12, and the display control circuit 14 shown in FIG. The drive IC 19 may consist of two or more IC chips, and some IC chips may be arranged on the wiring board 71.

As shown in FIG. 3, the facing substrate 3 includes a second substrate 31 and a color filter 32. The color filter 32 is provided on the surface of the second substrate 31 facing the first substrate 21. Further, the color filter 32 faces the liquid crystal layer 6 in a direction perpendicular to the first substrate 21. A polarizing plate 35 is provided on the second substrate 31 via the adhesive layer 36. The first substrate 21 and the second substrate 31 are glass substrates having a translucency capable of transmitting visible light. Alternatively, the first substrate 21 and the second substrate 31 may be a translucent resin substrate or a resin film made of a resin such as polyimide. The color filter 32 may be provided on the first substrate 21.

The first substrate 21 and the second substrate 31 are arranged so as to face each other with a predetermined space provided by the seal portion 66. The liquid crystal layer 6 is provided in the space surrounded by the first substrate 21, the second substrate 31, and the seal portion 66. The liquid crystal layer 6 modulates the light passing through the liquid crystal layer 6 according to the state of the electric field, and for example, a liquid crystal in a horizontal electric field mode such as IPS (inplane switching) including FFS (fringe field switching) is used. The liquid crystal layer 6 is provided as a display layer for displaying an image. An alignment film is disposed between the liquid crystal layer 6 and the array substrate 2 shown in FIG. 3 and between the liquid crystal layer 6 and the facing substrate 3, respectively.

In the present specification, the direction from the first substrate 21 to the second substrate 31 in the direction perpendicular to the surface of the first substrate 21 is referred to as "upper side". Further, the direction from the second substrate 31 to the first substrate 21 is defined as the "lower side". Further, the “planar view” indicates a case where the first substrate 21 is viewed from a direction perpendicular to the surface of the first substrate 21.

Further, the first direction Dx and the second direction Dy are directions parallel to the surface of the first substrate 21. The first direction Dx is orthogonal to the second direction Dy. However, the first direction Dx may intersect with the second direction Dy without being orthogonal to each other. The third direction Dz is a direction perpendicular to the surface of the first substrate 21. The third direction Dz is orthogonal to the first direction Dx and the second direction Dy.

As shown in FIG. 4, the first substrate 21 is formed with a region corresponding to the display region AA of the display panel 20 and the peripheral region GA provided outside the display region AA. The display area AA is an area that overlaps with a plurality of pixels Pix. Further, the display area AA is an area including a detection element such as the detection electrode 22 and the first electrode 23. In other words, the display area AA is an area in which the presence / absence of touch by a finger or the like and the touch pen 100 can be detected.

The plurality of detection electrodes 22 are arranged in a matrix in the display region AA. Each detection electrode 22 has a rectangular shape or a square shape in a plan view. The detection electrode 22 is made of a translucent conductive material such as ITO (Indium Tin Oxide). The detection electrode 22 may have another shape such as a polygonal shape.

The detection electrode wiring 51 is electrically connected to each of the detection electrodes 22. The plurality of detection electrode wirings 51 extend in the second direction Dy and are arranged side by side in the first direction Dx. In the present embodiment, the detection electrode wiring 51 is provided in a layer different from that of the detection electrode 22, and is provided in a region overlapping the detection electrode 22 in a plan view. The detection electrode wiring 51 is connected to the second detection circuit 13 included in the drive IC 19, respectively.

The plurality of first electrodes 23 extend in the first direction Dx and are arranged in the second direction Dy. A plurality of detection electrodes 22 arranged in the first direction Dx are arranged adjacent to one first electrode 23 and the second direction Dy. Further, the plurality of first electrodes 23 are arranged between the detection electrodes 22 adjacent to each other in the second direction Dy. The first electrode 23 is provided in the same layer as the detection electrode 22, and is provided in a region that does not overlap with the detection electrode 22 in a plan view. Further, the first electrode 23 is also separated from the detection electrode wiring 51. The first electrode 23 is made of the same material as the detection electrode 22, for example, a conductive material having translucency such as ITO (Indium Tin Oxide).

FIG. 5 is a circuit diagram showing a pixel arrangement of the display device according to the first embodiment. As shown in FIG. 5, the display panel 20 has a plurality of pixels Pix arranged in a matrix. The pixel Pix includes a switching element Tr and a liquid crystal element 6a, respectively. The switching element Tr is composed of a thin film transistor, and in this example, it is composed of an n-channel MOS (Metal Oxide Semiconductor) type TFT. An insulating layer 27 is provided between the pixel electrode 24 and the detection electrode 22 (common electrode), and the holding capacity 6b shown in FIG. 5 is formed by these.

The gate driver 15 shown in FIG. 1 sequentially selects the gate line GCL. The gate driver 15 applies the scan signal Vscan to the gate of the switching element Tr of the pixel Pix via the selected gate line GCL. As a result, one line (one horizontal line) of the pixel Pix is sequentially selected as the display drive target. Further, the source driver included in the display control circuit 14 supplies the pixel signal Vpix to the pixel Pix constituting the selected one horizontal line via the signal line SGL. Then, in these pixel Pix, the display is performed one horizontal line at a time according to the supplied pixel signal VPix. Although the gate driver 15 is arranged in two regions of the peripheral region GA that face each other with the display region AA in between in FIG. 4, the gate driver 15 may be arranged in one of the peripheral regions GA.

In the color filter 32 shown in FIG. 3, for example, the color region 32R, the color region 32G, and the color region 32B of the color filter 32 colored in three colors of red (R), green (G), and blue (B) are periodically formed. It is arranged. Each pixel Pix shown in FIG. 5 is associated with a color region 32R, a color region 32G, and a color region 32B of three colors R, G, and B. The color region associated with the pixel Pix may be a different color and may be a combination of other colors. Further, the color region associated with the pixel Pix is not limited to the combination of three colors, and may be a combination of four or more colors.

The detection electrode 22 shown in FIGS. 3 and 4 functions as a common electrode that gives a common potential to a plurality of pixels Pix of the display panel 20, and is also a drive electrode and a detection electrode for performing touch detection by the self-capacitance method. Also works as. During the display period, the display control circuit 14 supplies the display drive signal Vcomdc to the detection electrode 22 via the drive circuit 18.

As an example of the operation method of the display device 1, the display device 1 has an electromagnetic induction type touch detection (first sensor period), a self-capacitance type touch detection (second sensor period), and a display operation (display period). ) And time division. Each detection and display may be performed separately.

FIG. 6 is a circuit diagram showing a connection configuration of the first electrode. FIG. 7 is a block diagram showing a drive circuit that supplies various signals. FIG. 6 shows the connection configuration of the first electrode during the first sensor period.

As shown in FIG. 6, the plurality of first electrodes 23-1, 23-2, ..., 24-9 are arranged in the second direction Dy. In the following description, when it is not necessary to distinguish the first electrodes 23-1, 23-2, ..., 23-9, they are referred to as the first electrode 23. Further, in the following description, with reference to FIG. 6, one end of the first electrode 23 is referred to as the left end, and the other end is referred to as the right end.

The first drive signal supply wiring 52 and the second drive signal supply wiring 54 are provided on the left end side of the plurality of first electrodes 23, and the first drive signal supply wiring 53 and the second drive signal supply wiring 55 are provided on the right end side. Be done. The first drive signal supply wiring 52, 53 and the second drive signal supply wiring 54, 55 are wiring for supplying the first drive signal VTP to the first electrode 23.

The switch SW 11 is provided between the left end of each of the first electrodes 23 and the first drive signal supply wiring 52. The switch SW12 is provided between the left end of each of the first electrodes 23 and the second drive signal supply wiring 54. The switch SW11 and the switch SW12 are connected in parallel to the left end of each of the first electrodes 23.

Further, the switch SW13 is provided between the right end of each of the first electrodes 23 and the first drive signal supply wiring 53. The switch SW14 is provided between the right end of the first electrode 23 and the second drive signal supply wiring 55. The switch SW13 and the switch SW14 are connected in parallel to the right end of each of the first electrodes 23. The first drive signal supply wiring 52, 53, the second drive signal supply wiring 54, 55, and the switch SW11 to the switch SW14 are provided in the peripheral region GA. The first drive signal supply wiring 52, 53, the second drive signal supply wiring 54, 55, and the switch SW11 to the switch SW14 are connecting members that connect the ends of the plurality of first electrodes 23 to each other.

Here, as shown in FIG. 7, the drive circuit 18 detects various signals via the detection electrode wiring 51, the first drive signal supply wiring 52, 53, and the second drive signal supply wiring 54, 55, and the detection electrode 22. It is supplied to the first electrode 23. The drive circuit 18 includes a display drive signal supply circuit 18A, a second drive signal supply circuit 18B, a first voltage supply circuit 18C, and a second voltage supply circuit 18D. The display drive signal supply circuit 18A, the second drive signal supply circuit 18B, the first voltage supply circuit 18C, and the second voltage supply circuit 18D are mounted on the drive IC 19 (see FIG. 1). At least a part of the display drive signal supply circuit 18A, the second drive signal supply circuit 18B, the first voltage supply circuit 18C, and the second voltage supply circuit 18D may be provided as a circuit on the display panel 20.

The display drive signal supply circuit 18A supplies the display drive signal Vcomdc to the detection electrode 22 via the detection electrode wiring 51. Further, the display drive signal supply circuit 18A supplies the display drive signal Vcomdc to the first electrode 23 via the first drive signal supply wiring 52, 53 or the second drive signal supply wiring 54, 55. The second drive signal supply circuit 18B supplies the second drive signal VSELF for detection to the detection electrode 22 via the detection electrode wiring 51. The first voltage supply circuit 18C supplies a DC first voltage VTPH having a first potential to the first electrode 23 via the first drive signal supply wirings 52 and 53. The second voltage supply circuit 18D supplies the second voltage VTPL to the first electrode 23 via the second drive signal supply wirings 54 and 55. The second voltage VTPL is a DC voltage signal having a second potential smaller than the first potential.

As shown in FIG. 6, during the detection period of the electromagnetic induction method, the switches SW11, SW12, SW13, and SW14 operate in response to the control signal from the first detection control circuit 10, and the first electrode forming the transmission coil CTx. 23 is selected. Specifically, the first electrodes 23-2, 23-3, 23-4 and the first electrodes 23-6, 23-7, 23-8 are selected as the first electrode blocks BKE1 and BKE2. The other first electrode 23 is a non-selective electrode block. The region between the first electrode 23-4 and the first electrode 23-6 is a detection region Aem for detecting the object to be detected.

On the left side of the first electrodes 23-2, 23-3, 23-4, the switch SW11 is turned off and the switch SW12 is turned on. As a result, the left ends of the first electrodes 23-2, 23-3, and 23-4 are electrically connected to the second drive signal supply wiring 54. Further, on the right side of the first electrodes 23-2, 23-3, and 23-4, the switch SW13 is turned on and the switch SW14 is turned off. As a result, the right ends of the first electrodes 23-2, 23-3, and 23-4 are electrically connected to the first drive signal supply wiring 53.

On the left side of the first electrode 23-6, 23-7, 23-8, the switch SW11 is turned on and the switch SW12 is turned off. As a result, the left end of the first electrode 23-6, 23-7, 23-8 is electrically connected to the first drive signal supply wiring 52. On the right side of the first electrode 23-6, 23-7, 23-8, the switch SW13 is turned off and the switch SW14 is turned on. As a result, the right end of the first electrode 23-6, 23-7, 23-8 is electrically connected to the second drive signal supply wiring 55.

As a result, during the first sensor period, the second voltage supply circuit 18D is connected to the left end side of the first electrodes 23-2, 23-3, 23-4, and the first voltage supply circuit 18C is connected to the right end side. .. Further, the first voltage supply circuit 18C is connected to the left end side of the first electrode 23-6, 23-7, 23-8, and the second voltage supply circuit 18D is connected to the right end side.

The second voltage supply circuit 18D supplies the second voltage VTPL to the left ends of the first electrodes 23-2, 23-3, 23-4 via the second drive signal supply wiring 54. Further, the first voltage supply circuit 18C supplies the first voltage VTPH to the right ends of the first electrodes 23-2, 23-3, 23-4 via the first drive signal supply wiring 53. As a result, a potential difference is generated between the left end and the right end of the first electrodes 23-2, 23-3, 23-4, and the current I1 flows in the direction from the right end to the left end.

The first voltage supply circuit 18C supplies the first voltage VTPH to the left end of the first electrode 23-6, 23-7, 23-8 via the first drive signal supply wiring 52. Further, the second voltage supply circuit 18D supplies the second voltage VTPL to the right end of the first electrode 23-6, 23-7, 23-8 via the second drive signal supply wiring 55. As a result, a potential difference is generated between the left end and the right end of the first electrode 23-6, 23-7, 23-8, and the current I2 flows in the direction from the left end to the right end.

The first detection control circuit 10 changes the first voltage VTPH and the second voltage VTPL supplied to both ends of the first electrode 23 at a predetermined frequency by switching the operation of the switches SW11, SW12, SW13, and SW14. .. As a result, the first drive signal VTP, which is an AC voltage signal, is supplied to the first electrode 23.

A magnetic field is generated by the currents I1 and I2 flowing through the first electrode 23, and electromagnetic induction is formed. The current I1 and the current I2 flow in opposite directions. Therefore, the magnetic field generated by the current I1 and the magnetic field generated by the current I2 overlap in the detection region Aem. As a result, the strength of the magnetic field passing through the detection region Aem can be increased. The magnetic field generated by the current I1 and the current I2 corresponds to the magnetic field M1 generated during the magnetic field generation period of the electromagnetic induction method shown in FIG. Further, the first electrodes 23-2, 23-3, 23-4 included in the first electrode block BKE1 and the first electrodes 23-6, 23-7, 23-8 included in the first electrode block BKE2 are transmission coils. Corresponds to CTx.

Further, in FIG. 6, in the first electrode 23 (first electrode 23-1, 23-5, 23-9) of the non-selective electrode block, the switches SW11 and SW12 and the switches SW13 and SW14 are turned off. As a result, the first electrode 23 of the non-selective electrode block is in a floating state.

The first detection control circuit 10 sequentially selects the first electrode 23-1 to the first electrode 23-9. As a result, the entire display area AA is touch-detected by the electromagnetic induction method. The peripheral region GA may also be provided with the first electrode 23. As a result, a magnetic field can be generated even in the peripheral portion of the display area AA.

In FIG. 6, the transmission coil CTx is formed by the six first electrodes 23. However, the present invention is not limited to this, and the transmission coil CTx is formed by one or two first electrodes 23 arranged on one side of the detection region Aem and one or two first electrodes 23 arranged on the other side. You may. The transmission coil CTx may be formed by four or more first electrodes 23 arranged on one side of the detection region Aem and four or more first electrodes 23 arranged on the other side. Further, it is also possible to adopt a configuration in which the numbers thereof are not the same and the number of the first electrode 23 on one side is different from the number on the first electrode 23 on the other side. The number of the first electrodes 23 arranged between the plurality of first electrodes 23 having different current flow directions is not limited to one, and may be 0 or an integer of 2 or more.

Further, in the display period, all the switches SW11 and SW13 are turned off and all the switches SW12 and SW14 are turned on according to the control signal from the first detection control circuit 10. As a result, all the first electrodes 23 are cut off from the first drive signal supply wirings 52 and 53, the second drive signal supply wiring 54 is connected to the left end of all the first electrodes 23, and the second drive signal supply is supplied to the right end. The wiring 55 is connected.

As a result, during the display period, the display drive signal supply circuit 18A supplies the display drive signal Vcomdc to all the first electrodes 23 via the second drive signal supply wirings 54 and 55. At the same time, the display drive signal supply circuit 18A also supplies the display drive signal Vcomdc to the detection electrode 22 via the detection electrode wiring 51.

Further, during the second sensor period, the second drive signal supply circuit 18B supplies the second drive signal VSELF for detection to the detection electrode 22 via the detection electrode wiring 51. The detection electrode 22 outputs a signal (second detection signal Vdet2) corresponding to the change in self-capacitance due to contact or proximity of the detected object to the second detection circuit 13. In this case, the first detection control circuit 10 turns on all the switches SW11 and SW13 and turns off all the switches SW12 and SW14. The second drive signal supply circuit 18B supplies a guard drive signal to all the first electrodes 23 via the first drive signal supply wirings 52 and 53. The guard drive signal is a voltage signal having the same amplitude synchronized with the second drive signal VSELF. The guard drive signal may be a signal having the same potential as the second drive signal VSELF. As a result, the display device 1 can suppress the influence of the capacitive coupling between the detection electrode 22 and the first electrode 23.

The connection configuration shown in FIG. 6 is merely an example and can be changed as appropriate. For example, during the detection period of the electromagnetic induction method, the first voltage supply circuit 18C and the second voltage supply circuit 18D may supply the first voltage VTPH and the second voltage VTPL only to the left end of the first electrode 23. The second voltage supply circuit 18D supplies the second voltage VTPL to the left ends of the first electrodes 23-2, 23-3, 23-4 via the second drive signal supply wiring 54. Further, the first voltage supply circuit 18C supplies the first voltage VTPH to the left end of the first electrode 23-6, 23-7, 23-8 via the first drive signal supply wiring 52.

The right ends of the first electrodes 23-2, 23-3, and 23-4 and the right ends of the first electrodes 23-6, 23-7, and 23-8 are the first drive signal supply wiring 53 and the second drive. It is electrically connected by at least one of the signal supply wirings 55. Even in this case, the first electrodes 23-2, 23-3, 23-4 and the first electrodes 23-6, 23-7, 23-8 are formed as the transmission coil CTx.

FIG. 8 is a plan view showing the detection electrode and the first electrode according to the first embodiment. FIG. 9 is a cross-sectional view taken along the line IX-IX'in FIG. Note that FIG. 9 also shows the cross-sectional configuration of the switching element Tr provided in the pixel Pix.

As shown in FIG. 8, each of the plurality of detection electrodes 22 has a plurality of partial detection electrodes 22s. The individual detection electrode wiring 51s is connected to each of the plurality of partial detection electrodes 22s. Each of the plurality of individual detection electrode wirings 51s extends in the second direction Dy and is adjacent to the first direction Dx. The plurality of partial detection electrodes 22s included in one detection electrode 22 are electrically connected to one common detection electrode wiring 51t via the individual detection electrode wiring 51s connected to each.

The common detection electrode wiring 51t is connected to the drive circuit 18 of the drive IC 19. As a result, during the second sensor period, the same second drive signal VSELF is supplied to the plurality of partial detection electrodes 22s electrically connected to the common detection electrode wiring 51t. The signal corresponding to the change in the capacitance of each of the plurality of partial detection electrodes 22s is integrated via the common detection electrode wiring 51t, and the integrated signal is output to the second detection circuit 13. As a result, the plurality of partial detection electrodes 22s function as one detection electrode 22. Further, at the time of display, the same display drive signal Vcomdc is supplied to each of the plurality of partial detection electrodes 22s.

In FIG. 8, one detection electrode 22 has four partial detection electrodes 22s. It should be noted that one detection electrode 22 may have five or more partial detection electrodes 22s, or may have two or three partial detection electrodes 22s. The partial detection electrodes 22s adjacent to the first direction Dx are separated by the slit SL. Further, the first electrode 23 is arranged between a plurality of partial detection electrodes 22s adjacent to each other in the second direction Dy. The first electrode 23 and the partial detection electrode 22s are separated by a slit SL. A plurality of pixel electrodes 24 are arranged in a region overlapping the detection electrode 22 and the first electrode 23, respectively. Note that FIG. 8 shows some pixel electrodes to make the drawings easier to see.

With such a configuration, the arrangement pitch of the second direction Dy of the first electrode 23 is smaller than the arrangement pitch of the second direction Dy of the detection electrode 22. That is, the display device 1 can make the detection pitch of the touch detection of the electromagnetic induction method smaller than the detection pitch of the touch detection of the capacitance method.

Further, a metal wiring 28 is provided on the detection electrode 22 and the first electrode 23. The metal wiring 28 provided on the first electrode 23 extends in the first direction Dx. Further, the plurality of metal wirings 28 provided on the partial detection electrodes 22s are arranged in the second direction Dy. A plurality of metal wirings 28 are provided for each partial detection electrode 22s.

The metal wiring 28 is a metal material having higher conductivity than the detection electrode 22 and the first electrode 23. As a result, the total resistance value including the detection electrode 22 and the metal wiring 28 is reduced, and the total resistance value including the first electrode 23 and the metal wiring 28 is reduced. As a result, in the present embodiment, the responsiveness of the drive signal (first drive signal VTP, second drive signal VSELF) is responsive to either the electromagnetic induction method touch detection or the self-capacitance method touch detection. Is enhanced, and the detection sensitivity is improved.

As shown in FIG. 9, the switching element Tr includes a semiconductor 61, a source electrode 62, a drain electrode 63, and a gate electrode 64. The gate electrode 64 is provided on the first substrate 21 via the first insulating layer 91. The first insulating layer 91, the second insulating layer 92, the third insulating layer 93, and the insulating layer 27 are made of an inorganic insulating material such as a silicon oxide film (SiO), a silicon nitride film (SiN), or a silicon oxide nitride film (SiON). Used. Further, each inorganic insulating layer is not limited to a single layer and may be a laminated film.

The second insulating layer 92 is provided on the first insulating layer 91 so as to cover the gate electrode 64. The semiconductor 61 is provided on the second insulating layer 92. The gate electrode 64 is a portion of the gate wire GCL that overlaps with the semiconductor 61. The third insulating layer 93 covers the semiconductor 61 and is provided on the second insulating layer 92. The gate electrode 64 is provided between the semiconductor 61 and the first substrate 21 in a direction perpendicular to the first substrate 21. A channel region is formed in a portion of the semiconductor 61 that overlaps with the gate electrode 64.

In the example shown in FIG. 9, the switching element Tr has a so-called bottom gate structure. However, the switching element Tr may have a top gate structure in which the gate electrode 64 is provided on the upper side of the semiconductor 61. Further, the switching element Tr may have a dual gate structure in which the gate electrode 64 is provided with the semiconductor 61 interposed therebetween in the direction perpendicular to the first substrate 21.

The semiconductor 61 is composed of, for example, amorphous silicon, microcrystalline oxide semiconductor, amorphous oxide semiconductor, polysilicon, low temperature polysilicon (hereinafter referred to as LTPS (Low Temperature Polycrystalline Silicone)) or gallium nitride (GaN).

The source electrode 62 and the drain electrode 63 are provided on the third insulating layer 93. In this embodiment, the source electrode 62 is electrically connected to the semiconductor 61 via the contact hole H2. The drain electrode 63 is electrically connected to the semiconductor 61 via the contact hole H3. The source electrode 62 is a portion of the signal line SGL that overlaps with the semiconductor 61.

The fourth insulating layer 94 and the fifth insulating layer 95 are provided on the third insulating layer 93 so as to cover the source electrode 62 and the drain electrode 63. The fourth insulating layer 94 and the fifth insulating layer 95 are flattening layers for flattening irregularities formed by the switching element Tr and various wirings.

A relay electrode 65 and a detection electrode wiring 51 are provided on the fourth insulating layer 94. The relay electrode 65 is electrically connected to the drain electrode 63 via the contact hole H4. The detection electrode wiring 51 is provided on the upper side of the signal line SGL. Further, the detection electrode 22 and the first electrode 23 are provided on the fifth insulating layer 95. The first electrode 23 is provided in the same layer as the detection electrode 22. The detection electrode 22 is electrically connected to the detection electrode wiring 51 via the contact hole H1. Further, the plurality of metal wirings 28 are provided on the detection electrode 22 and the first electrode 23, respectively, and are in contact with the detection electrode 22 and the first electrode 23.

The pixel electrode 24 is electrically connected to the relay electrode 65 via the contact hole H5 provided in the insulating layer 27 and the fifth insulating layer 95. The contact hole H5 is formed at a position overlapping the opening 22a of the detection electrode 22. With such a configuration, the pixel electrode 24 is connected to the switching element Tr.

FIG. 10 is a circuit diagram showing a connection configuration of signal lines according to the first embodiment. FIG. 10 shows four signal lines SGL1, SGL2, SGL3, and SGL4 among the plurality of signal lines SGL. When it is not necessary to distinguish the signal lines SGL1, SGL2, SGL3, and SGL4 in the following description, they are referred to as signal lines SGL. Further, in FIG. 10, the first electrode 23 is shown by a two-dot chain line.

As shown in FIG. 10, the signal line SGL is provided so as to intersect the first electrode 23 in a plan view. A first connection switching circuit 16 is provided on one end side of the signal lines SGL1, SGL2, SGL3, and SGL4, and a second connection switching circuit 17 is provided on the other end side. The first connection switching circuit 16 is a switch circuit including switches SW21, SW22, and SW24. The second connection switching circuit 17 is a switch circuit including a switch SW23 and a signal line connection wiring 56. Further, in the following description, with reference to FIG. 10, one end of the signal line SGL is referred to as a lower end and the other end is referred to as an upper end.

In the first connection switching circuit 16, the switch SW21 switches between connection and disconnection between the signal lines SGL1 and SGL2 and the first detection circuit 11. The switch SW22 switches between connection and disconnection between each signal line SGL and the display control circuit 14. The switch SW24 switches between connection and disconnection between the signal lines SGL3 and SGL4 and the reference potential (for example, the ground potential GND).

In the second connection switching circuit 17, the switch SW23 and the signal line connection wiring 56 switch between connection and disconnection between the upper ends of the pair of signal lines SGL1 and SGL3. Further, the switch SW23 and the signal line connection wiring 56 switch between connection and disconnection between the upper ends of the pair of signal lines SGL2 and SGL4.

In the first sensor period, the switch SW23 is turned on in response to the control signal from the first detection control circuit 10. As a result, the upper ends of the pair of signal lines SGL1 and SGL3 are connected to each other via the signal line connection wiring 56. Similarly, the upper ends of the pair of signal lines SGL2 and SGL4 are connected to each other via the signal line connection wiring 56. Further, on the lower end side of the signal line SGL, the switch SW22 is turned off, and the switches SW21 and SW24 are turned on. As a result, the lower ends of the signal line SGL1 and the signal line SGL2 are connected to the first detection circuit 11, respectively. Further, the lower ends of the signal line SGL3 and the signal line SGL4 are connected to a reference potential (for example, the ground potential GND).

With such a configuration, a pair of signal lines SGL1 and SGL3 are connected in a loop to form a receiving coil CRx. Further, the pair of signal lines SGL2 and SGL4 are connected in a loop to form a receiving coil CRx. The receiving coil CRx is provided so as to overlap with the detection region Aem formed by the first electrode 23. The receiving coil CRx may be formed of a signal line block including a plurality of signal lines SGL, similarly to the transmitting coil CTx shown in FIG.

The magnetic field M2 from the touch pen 100 (see FIG. 3) is surrounded by a region surrounded by a pair of signal lines SGL1, SGL3 and a signal line connecting wire 56, or a pair of signal lines SGL2, SGL4 and a signal line connecting wire 56. When passing through the region, an electromotive force corresponding to the change in the magnetic field M2 is generated in each receiving coil CRx. The first detection signal Vdet1 corresponding to this electromotive force is supplied to the first detection circuit 11. As described above, during the first sensor period, the first electrode 23 is supplied with the first drive signal VTP from the drive circuit 18 to generate a magnetic field, and the signal line SGL generates an electromotive force due to the magnetic field. .. As a result, the display device 1 can detect the touch pen 100.

In the present embodiment, the adjacent receiving coils CRx are partially arranged so as to overlap each other. Specifically, the signal line SGL2 of the other receiving coil CRx is arranged in the region surrounded by the pair of signal lines SGL1 and SGL3 constituting one receiving coil CRx and the signal line connecting wiring 56. Further, the signal line SGL3 of one receiving coil CRx is arranged in the region surrounded by the pair of signal lines SGL2, SGL4 and the signal line connecting wiring 56 constituting the other receiving coil CRx. As a result, it is possible to suppress the occurrence of a region in which the detection sensitivity of the magnetic field is lowered or a dead region in which the magnetic field cannot be detected in the display region AA.

Further, during the display period, the switch SW23 is turned off according to the control signal from the first detection control circuit 10. As a result, the upper ends of the signal lines SGL1, SGL2, SGL3, and SGL4 are disconnected from each other. Further, the switches SW21 and SW24 are turned off, and the switch SW22 is turned on. As a result, the lower ends of the signal lines SGL1, SGL2, SGL3, and SGL4 are not connected to the first detection circuit 11 and the ground potential GND. The pixel signal Vpix is supplied to the signal line SGL via the switch SW22.

Further, during the second sensor period, the second detection control circuit 12 may supply a guard drive signal to a plurality of signal lines SGL. Alternatively, the second detection control circuit 12 may put a plurality of signal lines SGL in a floating state.

(Variation example of the first embodiment)
FIG. 11 is a plan view showing a detection electrode and a first electrode according to a modified example of the first embodiment. In this modification, the partial detection electrodes 22s are subdivided into pixels Pix arranged in the second direction Dy. The plurality of first electrodes 23 are provided between the partial detection electrodes 22s adjacent to the second direction Dy, and extend along the partial detection electrodes 22s in the first direction Dx. Metal wiring 28 is provided on each of the plurality of first electrodes 23.

The right ends of the plurality of first electrodes 23 are connected by the first electrode connection wiring 23a. The plurality of first electrodes 23 connected by the first electrode connection wiring 23a are connected to the first drive signal supply wiring 52, 53 and the second drive signal supply wiring 54, 55 to form a transmission coil CTx. In addition, four or more first electrodes 23 may be connected to one first electrode connection wiring 23a.

Since the partial detection electrodes 22s and the first electrode 23 are subdivided for each pixel Pix arranged in the second direction Dy, the display device 1 has a self-capacitance type touch detection and an electromagnetic induction type touch detection. You can increase the resolution of.

(Second Embodiment)
FIG. 12 is a circuit diagram showing a connection configuration of the first electrode according to the second embodiment. FIG. 13 is a circuit diagram showing a connection configuration of signal lines according to the second embodiment. In the following description, the components described in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, during the first sensor period, the signal line SGL is supplied with the first drive signal VTP from the drive circuit 18 to generate a magnetic field, and the first electrode 23 generates an electromotive force due to the magnetic field. do.

Specifically, as shown in FIG. 12, the left end of the first electrode 23-1 and the left end of the first electrode 23-4 are connected by the first electrode connection wiring 23a provided in the peripheral region GA. Further, the detection signal output lines 57-1 and 57-4 are connected to the right end of the first electrode 23-1 and the right end of the first electrode 23-4, respectively. The detection signal output lines 57-1 and 57-4 are connected to the first detection circuit 11. As a result, the first electrode 23-1, the first electrode 23-4, and the first electrode connection wiring 23a constitute the receiving coil CRx.

Similarly, the right end of the first electrode 23-3 and the right end of the first electrode 23-6 are connected by the first electrode connection wiring 23a provided in the peripheral region GA. Further, the detection signal output lines 57-3 and 57-6 are connected to the right end of the first electrode 23-3 and the left end of the first electrode 23-6, respectively. The detection signal output lines 57-3 and 57-5 are connected to the first detection circuit 11. As a result, the first electrode 23-3, the first electrode 23-6, and the first electrode connection wiring 23a constitute the receiving coil CRx. Further, the first electrode 23-5, the first electrode 23-8, and the first electrode connection wiring 23a constitute the receiving coil CRx.

Also in this embodiment, the adjacent receiving coils CRx are partially arranged so as to overlap each other. Specifically, the first of the other receiving coil CRx is in the region surrounded by the pair of first electrodes 23-1, the first electrode 23-4, and the first electrode connecting wiring 23a constituting one receiving coil CRx. Electrodes 23-3 are arranged. Further, in the region surrounded by the pair of first electrodes 23-3, the first electrodes 23-6, and the first electrode connection wiring 23a constituting the other receiving coil CRx, the first electrode 23-of one receiving coil CRx. 4 is arranged.

As shown in FIG. 13, the second connection switching circuit 17A includes switches SW30, SW31, and SW32. The switch SW30 is provided on the upper end side of the signal line SGL, and is provided between the upper end of the signal line SGL and the connection wiring L52Aa and the connection wiring 54Aa. The connection wiring 52Aa is provided on the upper end side of the signal line SGL and connects the first drive signal supply wiring 52A and the first drive signal supply wiring 53A. The connection wiring 54Aa is provided on the upper end side of the signal line SGL and connects the second drive signal supply wiring 54A and the second drive signal supply wiring 55A. The second connection switching circuit 17A is a signal line that supplies a first drive signal VTP from the first detection control circuit 10 instead of switching the connection between the signal lines SGL based on the control signal Vss from the first detection control circuit 10. Switch SGL.

The switch SW31 is provided between the connection wiring 54Aa and the upper end of the signal line SGL. The switch SW32 is provided between the connection wiring 52Aa and the upper end of the signal line SGL.

The first connection switching circuit 16A includes switches SW22, SW37, SW38, and SW39. The switch SW22 is connected to the display control circuit 14, and the pixel signal Vpix is supplied. The switch SW37 is provided between the lower end of the signal line SGL and the connection wiring 52Ac. The switch SW38 is provided between the connection wiring 54Ab and the connection wiring 52Ac (signal line SGL). The connection wiring 54Ab is provided on the lower end side of the signal line SGL and connects the first drive signal supply wiring 52A and the first drive signal supply wiring 53A. The switch SW39 is provided between the connection wiring 52Ab and the connection wiring 52Ac (signal line SGL). The connection wiring 52Ab is provided on the lower end side of the signal line SGL and connects the second drive signal supply wiring 54A and the second drive signal supply wiring 55A. The first connection switching circuit 16A switches the signal line SGL for supplying the first drive signal VTP from the first detection control circuit 10 instead of supplying the first detection signal Vdet1 from the signal line SGL to the first detection circuit 11.

The high level voltage VGH of the scan signal Vscan (see FIG. 1) is supplied to the gate line GCL via the switch SW33. The low level voltage VGL of the scan signal Vscan is supplied to the gate line GCL via the switch SW34.

In FIG. 13, four first electrodes 23-1, 23-2, 23-3, and 23-4 are shown for easy viewing of the drawing. The left end of the first electrode 23-1 is connected to the third drive signal supply wiring 58 via the detection signal output line 57. The right ends of the first electrode 23-1 and the first electrode 23-2 on the same side are connected to each other via the first electrode connection wiring 23a. Further, the left end of the first electrode 23-2 is connected to the third drive signal supply wiring 58 via the switch SW35, or the left end of the first electrode 23-2 is connected to the first detection circuit 11 via the switch SW36. Connected to. The pair of first electrodes 23-3 and the first electrode 23-4 are also connected in a loop shape in the same manner.

In the first sensor period, the switch SW22 is turned off and the switch SW37 and the switch SW30 are turned on in response to the control signal from the first detection control circuit 10. As a result, the signal line SGL is connected to each supply circuit shown in FIG. 7 via the first drive signal supply wiring 52A, 53A and the second drive signal supply wiring 54A, 55A.

Specifically, FIG. 13 describes a case where the transmission coil CTx is formed by the signal line SGL2 and the signal line SGL4. The region between the signal line SGL2 and the signal line SGL4 is the detection area Aem. The switch SW30 connected to the upper end side of the signal line SGL2 and the signal line SGL4 is turned on, respectively. Further, the switch SW37 connected to the lower end side of the signal line SGL2 and the signal line SGL4 is turned on.

On the upper end side of the signal line SGL2, the switch SW31 is turned off and the switch SW32 is turned on. As a result, the upper end of the signal line SGL2 is electrically connected to the first drive signal supply wirings 52A and 53A via the connection wiring 52Aa. Further, on the lower end side of the signal line SGL2, the switch SW38 is turned on and the switch SW39 is turned off. As a result, the lower end of the signal line SGL2 is electrically connected to the second drive signal supply wirings 54A and 55A via the connection wiring 54Ab.

On the upper end side of the signal line SGL4, the switch SW31 is turned on and the switch SW32 is turned off. As a result, the upper end of the signal line SGL4 is electrically connected to the second drive signal supply wirings 54A and 55A via the connection wiring 54Aa. Further, on the lower end side of the signal line SGL4, the switch SW38 is turned off and the switch SW39 is turned on. As a result, the lower end of the signal line SGL4 is electrically connected to the first drive signal supply wirings 52A and 53A via the connection wiring 52Ab.

The first voltage supply circuit 18C (see FIG. 7) supplies the first voltage VTPH to the upper end of the signal line SGL2 via the first drive signal supply wirings 52A and 53A. Further, the second voltage supply circuit 18D (see FIG. 7) supplies the second voltage VTPL to the lower end of the signal line SGL2 via the second drive signal supply wirings 54A and 55A. As a result, a potential difference is generated between the upper end and the lower end of the signal line SGL2, and the current I1 flows in the direction from the upper end to the lower end.

The first voltage supply circuit 18C supplies the first voltage VTPH to the lower end of the signal line SGL4 via the first drive signal supply wirings 52A and 53A. Further, the second voltage supply circuit 18D supplies the second voltage VTPL to the upper end of the signal line SGL4 via the second drive signal supply wirings 54A and 55A. As a result, a potential difference is generated between the upper end and the lower end of the signal line SGL4, and the current I2 flows in the direction from the lower end to the upper end.

In the present embodiment, by switching the operation of the switches SW31, SW32, SW38, and SW39, the first voltage VTPH and the second voltage VTPL supplied to both ends of the signal line SGL are changed at a predetermined frequency. As a result, the first drive signal VTP, which is an AC voltage signal, is supplied to the signal line SGL.

A magnetic field is generated by the currents I1 and I2 flowing in the signal line SGL, and electromagnetic induction is formed. In the example shown in FIG. 13, the signal line SGL2 and the signal line SGL4 correspond to the transmission coil CTx. The first detection control circuit 10 sequentially selects a plurality of signal lines SGL. As a result, the entire display area AA is touch-detected by the electromagnetic induction method. In FIG. 13, the transmission coil CTx is formed by the two signal lines SGL. However, the present invention is not limited to this, and transmission is performed by two or more signal line SGLs (signal line blocks) arranged on one side of the detection area Aem and two or more signal line SGLs (signal line blocks) arranged on the other side. Coil CTx may be formed. Further, it is possible to adopt a configuration in which the numbers are not the same and the number of one signal line SGL is different from the number of the other signal line SGL.

Further, a reference potential (ground potential GND) is supplied to the third drive signal supply wiring 58. A reference potential (ground potential GND) is supplied to the left end of the first electrode 23-1 and the left end of the first electrode 23-3 connected to the third drive signal supply wiring 58. Further, the switch SW35 connected to the left end of the first electrode 23-2 and the first electrode 23-4 is turned off, and the switch SW36 is turned on. As a result, the left end of the first electrode 23-2 and the left end of the first electrode 23-4 are connected to the first detection circuit 11. An electromotive force based on electromagnetic induction is generated in the receiving coil CRx formed by the first electrode 23. A current corresponding to this electromotive force (first detection signal Vdet1) is supplied to the first detection circuit 11.

On the other hand, the switches SW30, SW31, and SW32 connected to the upper end side of the signal lines SGL1, SGL3, and SGL5 are turned off, and the switches SW22, SW37, SW38, and SW39 connected to the lower end side are turned off. As a result, the ground potential GND, the first voltage VTPH, and the second voltage VTPL are not supplied to the signal lines SGL1, SGL3, and SGL5, resulting in a floating state.

Further, in a period different from the first sensor period (display period and second sensor period), the plurality of signal line SGLs are disconnected from each other by the operation of each switch.

Here, the detection electrode 22 is made of ITO, while the signal line SGL is made of metal. Therefore, the signal line SGL has a significantly lower resistance than the detection electrode 22. As a result, by using the signal line SGL as the drive electrode (transmission coil CTx), it is possible to suppress the dullness of the first drive signal VTP, which is an AC rectangular wave. As a result, the display device 1 enhances the responsiveness of the drive signal and improves the detection sensitivity.

(Third Embodiment)
FIG. 14 is a circuit diagram showing a connection configuration of the first electrode according to the third embodiment. FIG. 15 is a plan view showing the first electrode, the detection electrode, and the detection electrode wiring according to the third embodiment. FIG. 16 is a cross-sectional view taken along the line XVI-XVI'of FIG. Note that FIG. 16 also shows the cross-sectional configuration of the switching element Tr included in the pixel Pix.

In the present embodiment, the first electrode 23A is provided in the same layer as the detection electrode wiring 51. In other words, the first electrode 23A is provided on a layer different from that of the detection electrode 22. As shown in FIG. 14, the plurality of first electrodes 23A extend in the first direction Dx and are arranged in the second direction Dy. The plurality of first electrodes 23A are provided at positions overlapping the detection electrodes 22 in a plan view, and intersect with the plurality of detection electrode wirings 51. In the present embodiment, the first electrode 23A forms the transmission coil CTx, and the signal line SGL forms the reception coil CRx, as in FIGS. 6 and 10 shown in the first embodiment.

As shown in FIG. 15, the pixel electrode 24 includes a first pixel electrode 24a and a second pixel electrode 24b. The first pixel electrode 24a is inclined along the direction D1. The second pixel electrode 24b is tilted along the direction D2. The first pixel electrode 24a and the second pixel electrode 24b are alternately arranged in the second direction Dy.

The signal line SGL is provided along the first pixel electrode 24a and the second pixel electrode 24b. In the signal line SGL, a portion inclined along the direction D1 and a portion inclined along the direction D2 are alternately connected in the second direction Dy. The signal line SGL extends in the second direction Dy as a whole.

Here, the direction D1 is a direction inclined by an angle θ1 with respect to the second direction Dy. The direction D2 is a direction inclined by an angle θ2 with respect to the second direction Dy. In this embodiment, the angle θ1 is equal to the angle θ2. In other words, the direction D2 is a direction inclined in the direction opposite to the direction D1 with respect to the second direction Dy. However, the angle θ1 may be different from the angle θ2.

The first electrode 23A is arranged between the first pixel electrode 24a and the second pixel electrode 24b adjacent to the second direction Dy, and extends in the first direction Dx.

The partial detection electrodes 22s are provided in a region overlapping the three pixel electrodes 24, and a plurality of the partial detection electrodes 22s are arranged in the first direction Dx and the second direction Dy. The partial detection electrodes 22s adjacent to the second direction Dy are connected by the connecting portion 22t. The connecting portion 22t is provided between the pixel electrodes 24 adjacent to each other in the first direction Dx, and intersects the first electrode 23A in a plan view.

The detection electrode wiring 51 includes a first partial detection electrode wiring 51a, a second partial detection electrode wiring 51b, and a bridge wiring 51c. The first partial detection electrode wiring 51a is provided along the direction D1 and is provided between the first pixel electrodes 24a adjacent to the first direction Dx. The second partial detection electrode wiring 51b is provided along the direction D2 and is provided between the second pixel electrodes 24b adjacent to the first direction Dx. The first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b are arranged adjacent to each other in the second direction Dy with the first electrode 23A interposed therebetween. Further, the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b are provided so as to overlap with the signal line SGL.

The bridge wiring 51c is provided in a layer different from the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b, and connects the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b. The bridge wiring 51c intersects the first electrode 23A in a plan view. A notch 22b is formed at the corner of the partial detection electrode 22s. The bridge wiring 51c is provided in the opening formed by the notch 22b of the four partial detection electrodes 22s.

The bridge wiring 51c is preferably provided between the pixel Pix displaying red (R) and the pixel Pix displaying green (G). By doing so, the display device 1 can suppress a decrease in the aperture ratio of the pixel Pix displaying the blue color (B) having a low luminance.

As shown in FIG. 16, the semiconductor 61 of the switching element Tr is provided on the first insulating layer 91. The gate electrode 64 is provided on the semiconductor 61 via the second insulating layer 92. The switching element Tr of the present embodiment has a so-called top gate structure. The second electrode 67 is provided between the first substrate 21 and the semiconductor 61 in a direction perpendicular to the first substrate 21. The second electrode 67 is a material having a smaller light transmittance than the first substrate 21, and is used as a light-shielding layer. For the second electrode 67, for example, a metal material is used. In this embodiment, the switching element Tr may have a bottom gate structure or a dual gate structure as in FIG. 9.

The first partial detection electrode wiring 51a, the second partial detection electrode wiring 51b, and the first electrode 23A are provided on the fourth insulating layer 94. The bridge wiring 51c is provided on the fifth insulating layer 95 so as to straddle the first electrode 23A. The bridge wiring 51c is connected to the second partial detection electrode wiring 51b via the contact hole H6, and is connected to the first partial detection electrode wiring 51a via the contact hole H7. The bridge wiring 51c is provided in the same layer as the detection electrode 22. For the bridge wiring 51c, the same translucent conductive material as the detection electrode 22, for example, ITO is used.

In the present embodiment, the first electrode 23A is provided in the same layer as the detection electrode wiring 51 connected to the detection electrode 22. More specifically, the first electrode 23A is a layer different from the detection electrode 22, and is provided in the same layer as the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b. Therefore, the first electrode 23A can be formed of the same metal material as the detection electrode wiring 51. Therefore, the transmission coil CTx is formed by the first electrode 23A having good conductivity, so that the display device 1 is enhanced in the responsiveness of the drive signal.

(Modified example of the third embodiment)
FIG. 17 is a plan view showing the first electrode, the detection electrode, and the detection electrode wiring according to the modified example of the third embodiment. FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII'of FIG. As shown in FIG. 17, connection portions 51e are provided at the ends of the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b, respectively. The connection portion 51e bends from the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b, respectively, and extends in the direction along the first electrode 23A. The connection portion 51e extends to a position where it does not overlap with the signal line SGL and is connected to the bridge wiring 51c. The bridge wiring 51c connects the connection portion 51e of the first partial detection electrode wiring 51a and the connection portion 51e of the second partial detection electrode wiring 51b.

As shown in FIG. 18, the bridge wiring 51c is provided in the same layer as the signal line SGL. The bridge wiring 51c is provided under the first electrode 23A and is connected to the second partial detection electrode wiring 51b and the first partial detection electrode wiring 51a via the contact hole provided in the fourth insulating layer 94. Even with such a configuration, the first electrode 23A can be provided in the same layer as the detection electrode wiring 51 connected to the detection electrode 22. Since the bridge wiring 51c is provided in a layer different from that of the detection electrode 22, the detection electrode 22 may be provided in a region overlapping with at least a part of the bridge wiring 51c. Therefore, it is not necessary to form the notch 22b in the detection electrode 22.

(Fourth Embodiment)
FIG. 19 is a circuit diagram showing a connection configuration of the first electrode according to the fourth embodiment. FIG. 20 is a plan view showing the wiring of the first electrode and the detection electrode according to the fourth embodiment. In the present embodiment, during the detection period of the electromagnetic induction method, the signal line SGL is supplied with the first drive signal VTP from the drive circuit 18 to generate a magnetic field, and the first electrode 23A receives an electromotive force due to the magnetic field. Occurs. That is, the signal line SGL forms the transmission coil CTx, and the first electrode 23A forms the reception coil CRx.

As shown in FIG. 19, the first electrode 23A-1, the first electrode 23A-4, and the first electrode connecting wiring 23Aa form a receiving coil CRx. Further, the first electrode 23A-3, the first electrode 23A-6, and the first electrode connection wiring 23Aa form a receiving coil CRx. As in FIG. 13, one of the receiving coils CRx is connected to the reference potential and the other is connected to the first detection circuit 11 to output the detection signal Vdet1. Also in this embodiment, the adjacent receiving coils CRx are partially arranged so as to overlap each other. Further, the same configuration as in FIG. 13 can be applied to the connection configuration of the signal line SGL.

Similar to the third embodiment, the first electrode 23A is provided in the same layer as the detection electrode wiring 51. As shown in FIG. 20, the detection electrode wiring 51 has a first partial detection electrode wiring 51a, a second partial detection electrode wiring 51b, and a cross wiring portion 51d. The first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b connected to the second direction Dy are the main wiring portions of the detection electrode wiring 51. The two cross wiring portions 51d are connected to the first partial detection electrode wiring 51a and the second partial detection electrode wiring 51b, respectively, and extend in the first direction Dx. The two intersecting wiring portions 51d are arranged adjacent to each other in the second direction Dy with the first main portion 23Ab of the first electrode 23A interposed therebetween, and are located at positions not overlapping with the first main portion 23Ab of the first electrode 23A. It is connected to the second direction Dy by the partial detection electrode wiring 51a and the second partial detection electrode wiring 51b. In this way, the detection electrode wiring 51 extends in the second direction Dy as a whole.

The first electrode 23A has a first main portion 23Ab, a first crossing portion 23Ac, a second crossing portion 23Ad, a bridge portion 23Ae, and a second main portion 23Af. The first main portion 23Ab extends in the first direction Dx. The first crossing portion 23Ac is connected to the first main portion 23Ab and is provided along the direction D1. The second intersection 23Ad is connected to the first main portion 23Ab and is provided along the direction D2. Further, the first intersection 23Ac and the second intersection 23Ad are arranged adjacent to each other in the second direction Dy with the intersection wiring portion 51d of the detection electrode wiring 51 interposed therebetween. The bridge portion 23Ae is provided so as to intersect the cross wiring portion 51d in a plan view, and connects the first crossing portion 23Ac and the second crossing portion 23Ad. The bridge portion 23Ae may be provided in the same layer as the detection electrode 22 or may be provided in the same layer as the signal line SGL, as in the third embodiment.

The two second main portions 23Af are provided on opposite sides of the cross wiring portion 51d and the first main portion 23Ab, and one second main portion 23Af is connected to the first crossing portion 23Ac and the other second main portion 23Af. The main portion 23Af is connected to the second intersection portion 23Ad. With such a configuration, the first electrode 23A extends in the first direction Dx as a whole.

The first electrode 23A forms the receiving coil CRx. Even if the receiving coil CRx has a higher resistance value than the transmitting coil CTx, it is possible to suppress a deterioration in detection performance. Therefore, even if the bridge portion 23Ae is provided on the first electrode 23A, it is possible to suppress a decrease in the detection sensitivity of the touch detection of the electromagnetic induction method. On the other hand, the detection electrode wiring 51 is not provided with a bridge wiring. Therefore, in the touch detection of the self-capacitance method, the responsiveness of the second drive signal VSELF is enhanced, and the detection sensitivity is improved.

(Fifth Embodiment)
FIG. 21 is a circuit diagram showing a connection configuration of the first electrode and the second electrode according to the fifth embodiment. FIG. 22 is an enlarged plan view showing the second electrode according to the fifth embodiment. In the present embodiment, during the detection period of the electromagnetic induction method, the first electrode 23B is supplied with the first drive signal VTP from the drive circuit 18 to generate a magnetic field, and the second electrode 67 is generated by the magnetic field. Power is generated. That is, the first electrode 23B forms the transmission coil CTx, and the second electrode 67 forms the reception coil CRx.

As shown in FIG. 21, the plurality of first electrodes 23B extend in the second direction Dy and are arranged in the first direction Dx. Here, a plurality of first electrodes 23B including the first electrodes 23B-1, 23B-2, and 23B-3 are referred to as a first electrode block BKE1. A plurality of first electrodes 23B including the first electrodes 23B-4, 23B-5, and 23B-6 are referred to as a first electrode block BKE2. A first electrode connection wiring 59 is provided on the upper end side of the first electrode block BKE1 and the first electrode block BKE2. A switch SW40 is provided between the first electrode block BKE1 and the first electrode block BKE2 and the first electrode connection wiring 59.

A first drive signal supply wiring 52B, a second drive signal supply wiring 54B, a switch SW38, and a switch SW39 are provided on the lower end side of the first electrode block BKE1 and the first electrode block BKE2. Although only a part of the switch such as the switch SW40 is shown for easy viewing in the drawings, it is provided in each of the plurality of first electrodes 23B.

During the first sensor period, the switch SW40 is turned on, and the upper ends of the first electrode block BKE1 and the first electrode block BKE2 are connected via the first electrode connection wiring 59. Further, on the lower end side of the first electrode block BKE1, the switch SW38 is turned on and the switch SW39 is turned off. On the lower end side of the first electrode block BKE2, the switch SW38 is turned off and the switch SW39 is turned on.

The first voltage supply circuit 18C (see FIG. 7) supplies the first voltage VTPH to the lower end of the first electrode block BKE2 via the first drive signal supply wiring 52B. Further, the second voltage supply circuit 18D (see FIG. 7) supplies the second voltage VTPL to the lower end of the first electrode block BKE1 via the second drive signal supply wiring 54B. As a result, in the path formed by the first electrode block BKE1, the first electrode connection wiring 59, and the first electrode block BKE2, a potential difference is generated between the lower end of the first electrode block BKE1 and the lower end of the first electrode block BKE2. Due to this potential difference, currents I1 and I2 flow through the first electrode blocks BKE1 and BKE2.

By switching the operation of the switches SW38 and SW39, the first detection control circuit 10 changes the first voltage VTPH and the second voltage VTPL supplied to the lower ends of the first electrode blocks BKE1 and BKE2 at predetermined frequencies. As a result, the first drive signal VTP, which is an AC voltage signal, is supplied to the first electrode blocks BKE1 and BKE2.

The plurality of second electrodes 67 extend in the first direction Dx and are arranged in the second direction Dy. The second electrode blocks BK1, BK2, ..., BK8 each include a plurality of second electrodes 67. The left end of the second electrode block BK1 and the left end of the second electrode block BK3 are connected by the second electrode connection wiring 67a. At the right end of the second electrode block BK1 and the right end of the second electrode block BK3, one is a reference potential (for example, ground potential GND) and the other is a first detection circuit 11 via the capacitance CS and the detection signal output line 57, respectively. Connected to. As a result, the second electrode block BK1, the second electrode block BK3, and the second electrode connection wiring 67a constitute the receiving coil CRx.

Similarly, the right end of the second electrode block BK2 and the right end of the second electrode block BK5 are connected by the second electrode connection wiring 67a. At the left end of the second electrode block BK2 and the left end of the second electrode block BK5, one is a reference potential (for example, ground potential GND) and the other is a first detection circuit 11 via the capacitance CS and the detection signal output line 57, respectively. Connected to. As a result, the second electrode block BK2, the second electrode block BK5, and the second electrode connection wiring 67a form the receiving coil CRx. Further, the second electrode block BK4, the second electrode block BK7, and the second electrode connection wiring 67a constitute the receiving coil CRx. As in FIG. 13, one of the receiving coils CRx is connected to the reference potential and the other is connected to the first detection circuit 11 to output the detection signal Vdet1.

As shown in FIG. 22, the gate line GCL intersects the signal line SGL and extends in the first direction Dx. The second electrode 67 extends in the first direction Dx along the gate line GCL and is provided below the gate line GCL and the switching element Tr. The second electrode 67 is continuously provided over the plurality of pixels Pix and the switching element Tr arranged in the first direction Dx. The second electrode 67 is a light-shielding layer, and may be provided at least below the portion where the semiconductor 61 and the gate line GCL intersect. As a result, the second electrode 67 can suppress the optical leakage current of the switching element Tr. In FIG. 22, the pixel electrodes 24 of each pixel Pix are omitted in order to make the drawings easier to see.

FIG. 23 is an enlarged plan view showing a connection portion between the second electrode and the detection signal output line according to the fifth embodiment. FIG. 24 is a cross-sectional view taken along the line XXIV-XXIV'of FIG. 23. Note that FIG. 24 also shows the laminated configuration of the switching element Tr provided in the pixel Pix.

As shown in FIG. 23, each of the second electrode blocks BK forming the receiving coil CRx is provided with a capacitance CS. The capacitance CS has a first capacitance electrode CSE1 and a second capacitance electrode CSE2. The first capacitance electrode CSE1 and the second capacitance electrode CSE2 are provided so as to overlap each other in a plan view via a dielectric (insulating layer 27).

The second capacitance electrode CSE2 is connected to the end of the second electrode block BK via the relay wiring 57a. The plurality of second electrodes 67 of the second electrode block BK are connected by the second electrode connection wiring 67b. Further, the first capacitance electrode CSE1 is connected to the detection signal output line 57.

As shown in FIG. 24, the second electrode 67 is provided between the first substrate 21 and the semiconductor 61 in the display region AA, and extends to the peripheral region GA. The capacitance CS and the detection signal output line 57 are provided in the peripheral region GA. The first capacitance electrode CSE1 is provided on the insulating layer 27 in the same layer as the pixel electrode 24. The second capacitance electrode CSE2 is provided on the fifth insulating layer 95 in the same layer as the detection electrode 22. The first capacitance electrode CSE1 and the second capacitance electrode CSE2 face each other via the insulating layer 27 in the direction perpendicular to the first substrate 21. As a result, a capacitance is formed between the first capacitance electrode CSE1 and the second capacitance electrode CSE2. The layers formed by the first capacitance electrode CSE1 and the second capacitance electrode CSE2 may be reversed. That is, the second capacitance electrode CSE2 may be formed in the same layer as the pixel electrode 24, and the first capacitance electrode CSE1 may be formed in the same layer as the detection electrode 22.

The second capacitance electrode CSE2 is connected to the relay wiring 57a via the contact hole H11. The relay wiring 57a is connected to the second electrode 67 via the contact hole H13. Further, the first capacitance electrode CSE1 is connected to the detection signal output line 57 via the contact hole H12. The detection signal output line 57 and the relay wiring 57a are provided in the same layer as the signal line SGL.

With such a configuration, a capacitance CS is provided between the second electrode block BK and the first detection circuit 11. Due to the capacitance CS, the leakage current of the switching element Tr is suppressed, and good display performance can be obtained.

FIG. 25 is a plan view showing the wiring of the first electrode and the detection electrode according to the fifth embodiment. The first electrode 23B of the present embodiment is provided in the same layer as the detection electrode wiring 51. The first electrode 23B is provided in a region that overlaps with the plurality of detection electrodes 22 and is different from the region in which the detection electrode wiring 51 is provided. In FIG. 25, a plurality of detection electrode wirings 51 and a first electrode block BKE are provided adjacent to each other in the first direction Dx in a region overlapping the plurality of detection electrodes 22 arranged in the second direction Dy. With such a configuration, the first electrode block BKE can form the transmission coil CTx so as to intersect the reception coil CRx.

FIG. 26 is a timing waveform diagram showing an operation example of the display device according to the fifth embodiment. As shown in FIG. 26, the display device 1 alternately performs the display period PD and the second sensor period ES in a time division manner. The display device 1 executes the first sensor period EM in the same period as the display period PD. The first sensor period EM is a period during which the touch detection of the electromagnetic induction method is performed. The second sensor period ES is a period during which the touch detection of the self-capacitance method is performed.

As shown in FIG. 26, in the display period PD, the display control circuit 14 (see FIG. 1) supplies the pixel signal Vpix to the signal line SGL. Further, the drive circuit 18 (see FIG. 7) supplies the display drive signal Vcomdc to the detection electrode 22. As a result, the display of the display device 1 is executed.

In the first sensor period EM, the drive circuit 18 supplies the first drive signal VTP to the first electrode block BKE constituting the transmission coil CTx. The drive circuit 18 supplies the first drive signal VTP, which is an AC voltage signal, to the first electrode block BKE by alternately supplying the first voltage VTPH and the second voltage VTPL to both ends of the transmission coil CTx. Then, an electromotive force due to a magnetic field is generated in the second electrode 67 constituting the receiving coil CRx. As a result, the first detection signal Vdet1 is output to the first detection circuit 11.

In the second sensor period ES, the drive circuit 18 supplies the second drive signal VSELF to the detection electrode 22. Then, the detection electrode 22 outputs a second detection signal Vdet2 corresponding to the self-capacitance of the detection electrode 22 to the second detection circuit 13 (see FIG. 1). Further, the drive circuit 18 supplies the guard drive signal Vgd to the signal line SGL and the first electrode 23B. The guard drive signal Vgd is an AC square wave having at least the same amplitude as the second drive signal VSELF. For example, the guard drive signal Vgd may be an AC square wave having the same potential and the same phase. As a result, the display device 1 can suppress the capacitive coupling between the signal line SGL and the first electrode 23B and the detection electrode 22.

The timing waveform diagram shown in FIG. 26 is merely an example and can be changed as appropriate. For example, the lengths of the display period PD, the first sensor period EM, and the second sensor period ES may be different from each other. Further, the display period PD and the first sensor period EM may be performed in different periods. The order of the display period PD, the first sensor period EM, and the second sensor period ES can be changed as appropriate. Further, only one of the first sensor period EM and the second sensor period ES may be arranged in one frame period.

(Variation example of the fifth embodiment)
FIG. 27 is a circuit diagram showing a connection configuration of the first electrode and the second electrode according to the modified example of the fifth embodiment. In the display device 1 of this modification, in the first sensor period EM, the second electrode 67 is supplied with the first drive signal VTP from the drive circuit 18 to generate a magnetic field, and the first electrode 23B is in a magnetic field. The resulting electromotive force is generated. That is, the first electrode 23B forms the receiving coil CRx, and the second electrode 67 forms the transmitting coil CTx. As in FIG. 10, one of the receiving coils CRx is connected to the reference potential (for example, the ground potential GND), and the other is connected to the first detection circuit 11 to output the detection signal Vdet1.

The connection configuration of the first electrode 23B and the second electrode 67 is the same as the configuration shown in FIGS. 6 and 10 of the first embodiment. That is, the first voltage VTPH and the second voltage VTPL alternate from the drive circuit 18 via the first drive signal supply wiring 52, 53 and the second drive signal supply wiring 54, 55 at both ends of the second electrode 67. Is supplied to. As a result, the first drive signal VTP is supplied to the transmission coil CTx to generate a magnetic field. The upper ends of the plurality of first electrodes 23B are connected by the first electrode connection wiring 59 to form a receiving coil CRx. An electromotive force due to a magnetic field is generated in the receiving coil CRx. The lower end of the first electrode 23B is connected to the first detection circuit 11, and the first detection signal Vdet1 is output to the first detection circuit 11.

(Sixth Embodiment)
FIG. 28 is a cross-sectional view showing a schematic cross-sectional structure of the display device according to the sixth embodiment. FIG. 29 is a plan view showing the detection electrode and the detection electrode wiring according to the sixth embodiment. FIG. 30 is a cross-sectional view taken along the line XXX-XXX' in FIG. 29. FIG. 31 is a plan view showing the guard electrode according to the sixth embodiment.

In the display device 1A of the present embodiment, the shield electrode 33 is provided on the second substrate 31. In other words, the shield electrode 33 is provided on the upper side of the detection electrode 22 in the direction perpendicular to the first substrate 21. Further, a protective layer 38 is provided on the shield electrode 33. A polarizing plate 35 is provided on the protective layer 38 via the adhesive layer 36. Further, the wiring board 72 is provided on the second board 31. The shield electrode 33 is connected to the first detection control circuit 10 and the second detection control circuit 12 of the drive IC 19 via the wiring board 71 and the wiring board 72. The wiring board 72 is, for example, a flexible printed circuit board.

As shown in FIG. 29, the detection electrode wiring 51 is provided in a region that does not overlap with the detection electrode 22, and extends in the second direction Dy. The plurality of detection electrodes 22 arranged in the second direction Dy are the detection electrodes 22-1, 22-2, 22-3, 22-4, and 22-5. The detection electrode 22-2 is adjacent to one detection electrode wiring 51 connected to the detection electrode 22-1. The detection electrode 22-3 is adjacent to two detection electrode wirings 51 connected to the detection electrode 22-1 and the detection electrode 22-2, respectively. In this way, the width of the first direction Dx decreases in the order of the detection electrodes 22-1, 22-2, 22-3, 22-4, and 22-5.

As shown in FIG. 30, the detection electrode wiring 51 is provided on the fourth insulating layer 94 in the same layer as the detection electrode 22. The detection electrode wiring 51 has a translucent conductive layer 51n and a metal layer 51m. The translucent conductive layer 51n is provided on the fourth insulating layer 94, and the same material as the detection electrode 22, for example, a conductive material having translucency such as ITO is used. The metal layer 51m is provided on the translucent conductive layer 51n. In the present embodiment, since the detection electrode wiring 51 and the detection electrode 22 are provided in the same layer, the fifth insulating layer 95 can be omitted as compared with the first embodiment and the like.

As shown in FIG. 31, the shield electrode 33 has a plurality of individual shield electrodes 33S-1, 33S-2, 33S-3, 33S-4, 33S-5, .... A plurality of individual shield electrodes 33S-1, 33S-2, 33S-3, 33S-4, 33S-5, ... Are arranged in the second direction Dy. In the following description, when it is not necessary to distinguish the individual shield electrodes 33S-1, 33S-2, 33S-3, 33S-4, and 33S-5, they are referred to as individual shield electrodes 33S.

The individual shield electrode 33S-1 has a first shield wiring 33a, a second shield wiring 33b, a third shield wiring 33c, a dummy wiring 33d, and a connection wiring 33e. Each portion constituting the individual shield electrode 33S-1 has a plurality of metal wirings, and the plurality of metal wirings are formed in a mesh shape. The metal wiring of each portion of the individual shield electrode 33S-1 may have other shapes such as a zigzag linear shape, a wavy linear shape, and a linear shape.

The first shielded wiring 33a and the second shielded wiring 33b each extend in the first direction Dx and are arranged adjacent to each other in the second direction Dy. The plurality of third shielded wirings 33c are provided between the first shielded wiring 33a and the second shielded wiring 33b, and are connected to each of the first shielded wiring 33a and the second shielded wiring 33b. The plurality of third shielded wirings 33c are arranged along the first shielded wirings 33a and the second shielded wirings 33b. The third shield wiring 33c adjacent to the second direction Dy is separated by a slit.

The first shielded wiring 33a and the second shielded wiring 33b are provided from the display area AA to the peripheral area GA. In the individual shield electrode 33S-1, the right end of the first shield wiring 33a and the right end of the second shield wiring 33b are connected by the connection wiring 33e in the peripheral region GA. Further, the dummy wiring 33d is provided in the area surrounded by the first shield wiring 33a, the second shield wiring 33b, and the third shield wiring 33c. The dummy wiring 33d is not connected to the first shield wiring 33a, the second shield wiring 33b, and the third shield wiring 33c, and is in a floating state.

In the individual shield electrode 33S-2, the left end of the first shield wiring 33a and the left end of the second shield wiring 33b are connected by the connection wiring 33e in the peripheral region GA. In the individual shield electrode 33S-3, the right end of the first shield wiring 33a and the right end of the second shield wiring 33b are connected by the connection wiring 33e in the peripheral region GA. In this way, the plurality of individual shield electrodes 33S arranged in the second direction Dy are alternately provided with the positions of the connection wirings 33e.

As shown in FIG. 30, the dummy wiring 33d is arranged above the detection electrode 22. The third shield wiring 33c is arranged above the detection electrode wiring 51. In the second sensor period ES, the drive circuit 18 supplies a guard drive signal Vgd to each of the individual shield electrodes 33S. As a result, the capacitive coupling between the detection electrode wiring 51 and the detected body is suppressed. On the other hand, a floating dummy wiring 33d is provided on the upper side of the detection electrode 22. Therefore, the detection electrode 22 can satisfactorily perform touch detection by the self-capacitance method.

In the present embodiment, in the first sensor period EM, the signal line SGL is formed as the transmission coil CTx, and the shield electrode 33 is formed as the reception coil CRx. As the connection configuration of the signal line SGL, the same configuration as in FIG. 10 of the first embodiment can be applied.

In the individual shield electrode 33S, the first shield wiring 33a, the second shield wiring 33b, and the connection wiring 33e are connected in a loop, respectively, to form a receiving coil CRx. One end of the individual shield electrode 33S opposite to the connection wiring 33e is connected to a reference potential (for example, ground potential GND), and the other is connected to the first detection circuit 11 via the wiring board 71 and the wiring board 72. Be connected. As a result, an electromotive force is generated in the receiving coil CRx due to the magnetic field, and the first detection signal Vdet1 is output to the first detection circuit 11.

(Modified example of the sixth embodiment)
FIG. 32 is a plan view showing a guard electrode according to a modified example of the sixth embodiment. In this modification, the signal line SGL functions as the transmission coil CTx, and the shield electrode 33 is formed as the reception coil CRx. The configuration of the shield electrode 33 is the same as that in FIG. 31, and detailed description thereof will be omitted.

As shown in FIG. 32, a first drive signal supply wiring 52, a second drive signal supply wiring 54, and switches SW11 and SW12 are provided on the left side of the shield electrode 33. The switches SW11 and SW12 are connected to the first shield wiring 33a and the second shield wiring 33b of the individual shield electrodes 33S-1, 33S-3, 33S-5. Further, a first drive signal supply wiring 53, a second drive signal supply wiring 55, and switches SW13 and SW14 are provided on the right side of the shield electrode 33. The switches SW13 and SW14 are connected to the first shield wiring 33a and the second shield wiring 33b of the individual shield electrodes 33S-2 and 33S-4.

In the individual shield electrodes 33S-1, 33S-3, 33S-5, for example, the switch SW11 connected to the first shield wiring 33a is turned on and the switch SW12 is turned off by the first detection control circuit 10. At this time, the switch SW11 connected to the second shield wiring 33b is turned off, and the switch SW12 is turned on. Alternatively, the switch SW12 connected to the first shield wiring 33a is turned on, and the switch SW11 is turned off. At this time, the switch SW12 connected to the second shield wiring 33b is turned off, and the switch SW11 is turned on. As a result, a potential difference is generated between the left end of the first shielded wiring 33a and the left end of the second shielded wiring 33b, and the current I1 flows through the first shielded wiring 33a, the connecting wiring 33e, and the second shielded wiring 33b. The same applies to the individual shield electrodes 33S-2 and 33S-4.

The first detection control circuit 10 changes the first voltage VTPH and the second voltage VTPL supplied to both ends of the individual shield electrode 33S at a predetermined frequency by switching the operation of the switches SW11, SW12, SW13, and SW14. .. As a result, the first drive signal VTP, which is an AC voltage signal, is supplied to the individual shield electrode 33S. Further, as in FIG. 10, one of the signal lines SGL is connected to the reference potential (for example, the ground potential GND), and the other is connected to the first detection circuit 11. As a result, the signal line SGL forms a receiving coil, an electromotive force is generated in the receiving coil CRx due to the magnetic field, and the first detection signal Vdet1 is output to the first detection circuit 11.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to such an embodiment. The contents disclosed in the embodiments are merely examples, and various changes can be made without departing from the spirit of the present invention. Appropriate changes made without departing from the spirit of the present invention naturally belong to the technical scope of the present invention. At least one of the various omissions, substitutions and modifications of the components may be made without departing from the gist of each of the embodiments and modifications described above.

1, 1A Display device 2 Array board 3 Opposite board 10 1st detection control circuit 11 1st detection circuit 12 2nd detection control circuit 13 2nd detection circuit 14 Display control circuit 16 1st connection switching circuit 17 2nd connection switching circuit 18 Drive circuit 19 Drive IC
20 Display panel 21 1st substrate 22 Detection electrode 22s Partial detection electrode 23, 23A, 23B 1st electrode 23a, 23Aa, 59 1st electrode Connection wiring 24 Pixel electrode 28 Metal wiring 31 2nd substrate 33 Shield electrode 33S Individual shield electrode 51 Detection electrode wiring 52, 52A, 52B, 53, 53A 1st drive signal supply wiring 54, 54A, 54B, 55, 55A 2nd drive signal supply wiring 57 Detection signal output line 58 3rd drive signal supply wiring 67 2nd electrode 100 Touch pen AA Display area CTx Transmit coil CRx Receive coil CS capacity CSE1 1st capacity electrode CSE2 2nd capacity electrode GA peripheral area GCL Gate line SGL signal line Tr Switching element VTP 1st drive signal VSELF 2nd drive signal

Claims (19)

With the board
With multiple pixel electrodes,
A plurality of detection electrodes arranged in a matrix in the display area of the substrate,
A plurality of detection electrode wirings connected to each of the plurality of detection electrodes,
A plurality of first electrodes provided in the same layer as either the detection electrode or the detection electrode wiring and extending in the first direction,
A switching element connected to each of the plurality of pixel electrodes,
A plurality of signal lines connected to the switching element and extending in the second direction intersecting the first direction, and
A connecting member provided in a peripheral region outside the display region and connecting a plurality of ends of the first electrode, and a connecting member.
A display device having a drive circuit that outputs a first drive signal during the first sensor period by the electromagnetic induction method. During the first sensor period, the first electrode is supplied with the first drive signal from the drive circuit to generate a magnetic field.
The display device according to claim 1, wherein an electromotive force generated by the magnetic field is generated in the signal line. During the first sensor period, the signal line is supplied with the first drive signal from the drive circuit to generate a magnetic field.
The display device according to claim 1, wherein an electromotive force generated by the magnetic field is generated on the first electrode. The first electrode is provided in the same layer as the detection electrode.
The display device according to any one of claims 1 to 3, wherein the plurality of detection electrodes arranged in the first direction are provided adjacent to one of the first electrodes in the second direction. The first electrode and the detection electrode are conductive materials having translucency.
The display device according to claim 4, wherein a metal wiring is provided on the first electrode in contact with the first electrode. The plurality of detection electrodes each have a plurality of partial detection electrodes.
The display device according to claim 4 or 5, wherein the plurality of the partial detection electrodes are electrically connected to the common detection electrode wiring via the individual detection electrode wirings connected to the respective partial detection electrodes. The display device according to claim 6, wherein the first electrode is provided between a plurality of the partial detection electrodes adjacent to each other in the second direction. The detection electrode wiring extends in the second direction,
The display device according to any one of claims 1 to 3, wherein the first electrode is provided in the same layer as the detection electrode wiring and intersects the plurality of detection electrode wirings in a plan view. The plurality of detection electrode wirings have a first partial detection electrode wiring and a second partial detection electrode wiring, respectively.
The first partial detection electrode wiring and the second partial detection electrode wiring are arranged adjacent to each other with the first electrode interposed therebetween in the second direction, and a bridge wiring provided in a layer different from the detection electrode wiring is provided. The display device according to claim 8, which is electrically connected via the display device. The display device according to claim 9, wherein the bridge wiring is provided on the same layer as the detection electrode. The first partial detection electrode wiring and the second partial detection electrode wiring are respectively arranged so as to overlap the signal line in a plan view, and have a connection portion provided at a position not overlapping with the signal line.
The display according to claim 9, wherein the bridge wiring is provided in the same layer as the signal line, and connects the connection portion of the first partial detection electrode wiring and the connection portion of the second partial detection electrode wiring. Device. The detection electrode wiring has a main wiring portion extending in the second direction and a cross wiring portion connected to the main wiring portion and extending in the first direction.
The first electrode has a main portion extending in the first direction, and a first intersection portion and a second intersection portion adjacent to each other in the second direction with the cross wiring portion interposed therebetween.
The display device according to claim 8, wherein the first intersection and the second intersection are electrically connected via a bridge wiring provided in a layer different from the detection electrode wiring. With the board
With multiple pixel electrodes,
A plurality of detection electrodes arranged in a matrix in the display area of the substrate,
A plurality of detection electrode wirings connected to each of the plurality of detection electrodes,
A switching element connected to each of the plurality of pixel electrodes,
A second electrode provided between the semiconductor of the switching element and the substrate in a direction perpendicular to the substrate and extending in the first direction, and a second electrode.
A plurality of first electrodes provided in the same layer as either the detection electrode or the detection electrode wiring and extending in the second direction intersecting the first direction,
A connecting member provided in a peripheral region outside the display region and connecting a plurality of ends of the first electrode, and a connecting member.
A display device having a drive circuit that outputs a first drive signal during the first sensor period by the electromagnetic induction method. During the first sensor period, the first electrode is supplied with the first drive signal from the drive circuit to generate a magnetic field.
The display device according to claim 13, wherein an electromotive force generated by the magnetic field is generated on the second electrode. During the first sensor period, the second electrode is supplied with the first drive signal from the drive circuit to generate a magnetic field.
The display device according to claim 13, wherein an electromotive force generated by the magnetic field is generated on the first electrode. The display device according to any one of claims 13 to 15, wherein the second electrode has a light transmittance smaller than that of the substrate. The display device according to any one of claims 13 to 16, wherein the first electrode is provided in the same layer as the detection electrode wiring. The second electrode is connected to the detection signal output line via a capacitance, and is connected to the detection signal output line.
The capacity is
A first capacitance electrode provided in the same layer as the plurality of pixel electrodes,
The display device according to claim 13, further comprising a second capacitance electrode facing the first capacitance electrode and provided in the same layer as the detection electrode. During the second sensor period, the drive circuit supplies a second drive signal to the detection electrode via the detection electrode wiring.
The display device according to any one of claims 1 to 18, wherein the plurality of detection electrodes output a signal corresponding to their respective self-capacitance.

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